This is a bug fix release of the Term and Category based Posts Widget plugin intended to solve a compatibility issue with the toolset plugin and other plugins which use an older version of the select2 javascript library than the one we use. That library is used in order to provide a nicer UI to select multiple terms. While (at the time of writing) we use the 4.0.1 version of the library, a client was using a version of the toolset plugin which used version 3.4.5. Since the select2 library is not backward compatible, there was a javascript exception caused by us using an API option which is available in 4.0 but not in 3.4.5.
Luckily, it was easy to just avoid using that option to be compatible with 3.4.5 and the degradation of UX that is experienced in this situation can barely be noticed.
We are going to try to figure out how not only fail gracefully, but also notify the user, but this will have to wait for a “full” release.
BTW, this is our first true test of the automatic upgrade system, so if you have any problem upgrading, please give us a call.